sl@0: // Copyright David Abrahams 2002.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: #ifndef SCOPE_DWA2002724_HPP
sl@0: # define SCOPE_DWA2002724_HPP
sl@0: 
sl@0: # include <boost/python/detail/prefix.hpp>
sl@0: # include <boost/python/object.hpp>
sl@0: # include <boost/python/refcount.hpp>
sl@0: # include <boost/utility.hpp>
sl@0: 
sl@0: namespace boost { namespace python { 
sl@0: 
sl@0: namespace detail
sl@0: {
sl@0:   // Making this a namespace-scope variable to avoid Cygwin issues.
sl@0:   // Use a PyObject* to avoid problems with static destruction after Py_Finalize
sl@0:   extern BOOST_PYTHON_DECL PyObject* current_scope;
sl@0: }
sl@0: 
sl@0: class scope
sl@0:   : public object
sl@0: {
sl@0:  public:
sl@0:     inline scope(scope const&);
sl@0:     inline scope(object const&);
sl@0:     inline scope();
sl@0:     inline ~scope();
sl@0:     
sl@0:  private: // data members
sl@0:     PyObject* m_previous_scope;
sl@0: 
sl@0:  private: // unimplemented functions
sl@0:     void operator=(scope const&);
sl@0: };
sl@0: 
sl@0: inline scope::scope(object const& new_scope)
sl@0:     : object(new_scope)
sl@0:     , m_previous_scope(detail::current_scope)
sl@0: {
sl@0:     detail::current_scope = python::incref(new_scope.ptr());
sl@0: }
sl@0: 
sl@0: inline scope::scope()
sl@0:     : object(detail::borrowed_reference(
sl@0:                  detail::current_scope ? detail::current_scope : Py_None
sl@0:                  ))
sl@0:     , m_previous_scope(python::xincref(detail::current_scope))
sl@0: {
sl@0: }
sl@0: 
sl@0: inline scope::~scope()
sl@0: {
sl@0:     python::xdecref(detail::current_scope);
sl@0:     detail::current_scope = m_previous_scope;
sl@0: }
sl@0: 
sl@0: namespace converter
sl@0: {
sl@0:   template <>
sl@0:   struct object_manager_traits<scope>
sl@0:       : object_manager_traits<object>
sl@0:   {
sl@0:   };
sl@0: }
sl@0: 
sl@0: // Placing this after the specialization above suppresses a CWPro8.3 bug
sl@0: inline scope::scope(scope const& new_scope)
sl@0:     : object(new_scope)
sl@0:     , m_previous_scope(detail::current_scope)
sl@0: {
sl@0:     detail::current_scope = python::incref(new_scope.ptr());
sl@0: }
sl@0: 
sl@0: }} // namespace boost::python
sl@0: 
sl@0: #endif // SCOPE_DWA2002724_HPP